689667191 has 8 divisors (see below), whose sum is σ = 706839504. Its totient is φ = 672511680.

The previous prime is 689667157. The next prime is 689667197. The reversal of 689667191 is 191766986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689667191 - 2⁶ = 689667127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689667197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135800 + ... + 140786.

It is an arithmetic number, because the mean of its divisors is an integer number (88354938).

Almost surely, 2^689667191 is an apocalyptic number.

689667191 is a deficient number, since it is larger than the sum of its proper divisors (17172313).

689667191 is a wasteful number, since it uses less digits than its factorization.

689667191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8401.

The product of its digits is 979776, while the sum is 53.

The square root of 689667191 is about 26261.5153980116. The cubic root of 689667191 is about 883.5134976368.

The spelling of 689667191 in words is "six hundred eighty-nine million, six hundred sixty-seven thousand, one hundred ninety-one".